Hi JoeO,
Our Query Builder does not support the exact same operator you mentioned.
But if you need custom operator you can have look at the https://www.htmlelements.com/docs/querybuilder-api/#toc-customoperations_any .
Please, do not hesitate to contact us if you have any additional questions.
Best regards,
Yavor Dashev
Smart UI Team
https://www.htmlelements.com/